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MHT CET 2021 (24 Sep, Shift 2) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from MHT CET 2021 (24 Sep, Shift 2)

Q104MHT CET 2021 · 24 SEP · SHIFT 2Medium

Photoelectric Effect: Einstein's Equation

A light of wavelength ' $\lambda$ ' and intensity ' $I$ ' falls on photosensitive material. If ' $N$ ' photo electrons are emitted, each with kinetic energy 'E', then

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Answer: (d)

$E = \frac{hc}{\lambda} - \phi$ : kinetic energy depends on wavelength (increases as $\lambda$ decreases), not on intensity, so $E \propto \frac{1}{\lambda}$ (approximately).
Number of photoelectrons depends on number of photons, i.e. on intensity: $N \propto I$ .
So the answer is (d).

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